We haven't been to CSA (yet) or CN but were at CTI last year. The beach there is a private one and the water is generally calm. We do not spend a lot of time on the beach but talked to many that spent there day chasing palm tree shadows and spent time floating on the water. It is very relaxing.

We are beach people and enjoying being there all day long. We missed the CN beach when we were at CTI. It is very small and no room to walk along the shoreline. We prefer the beach at CN over CTI or even CSS.